Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e2005610fc23f4…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 18:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5cb0f6433685b1e76b3b4d992cdfbfda SHA-1: 3ba0b5f8d53d64b4091853893072c69c2fa6ba21 SHA-256: f2e2005610fc23f4b0be44ce0e456a239ebdf187fba67cca3c190cad29fd0235
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ClamAV detection and ML classifier further support the malicious classification, pointing towards phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/aws?utm_term=critical+thinking+skills+of+nursing+students+in+lecture-based+teaching+and+case-based+learning PDF link annotation
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/db3db985.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/mimagipewaguwal.pdfIn PDF document text
    • https://nibovipuduri.weebly.com/uploads/1/3/0/8/130814681/kabamomu.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/58c5f99f.pdfIn PDF document text
    • https://gatimosuxanad.weebly.com/uploads/1/3/2/8/132814295/e1d7241.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/365b09a1e18b.pdfIn PDF document text
    • https://patewowuxafopon.weebly.com/uploads/1/3/4/5/134595548/9089827.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/102b9.pdfIn PDF document text
    • https://rifuvosibimav.weebly.com/uploads/1/3/5/3/135383082/004472.pdfIn PDF document text
    • https://vidujari.weebly.com/uploads/1/3/4/8/134858315/namabegumomem_kezimaxakesifet_rusowatuvim.pdfIn PDF document text
    • https://tinozuxitijerel.weebly.com/uploads/1/3/4/5/134528375/edda108e8e18.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/729fade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15575d9-290f-48c9-b008-58b66711a7f7/finance_formulas_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7310c126-7376-42e3-a3ff-2096b931c229/ifr_6000_calibration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/950719ce-1838-4e0e-9b66-b8d86aa8a307/24584287063.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/ariens_724_snowblower_engine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fb30cf-7b39-4f46-a46c-10addb963df1/bidudobogivumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f3f12e-77fa-4a31-b624-1848fc768636/multiple_intelligences_survey_for_elementary_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2adf0740-5ee7-4051-aac4-0795889a6c2a/secure_wifi_calling_app.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/36972646267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c925c0-1052-4d75-b915-c45ab42a569e/nikon_coolpix_l22_battery_door_fix.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/630022739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61fd051c-088f-4c71-89e9-f67d078446d2/namuzeneve.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5424 bytes
SHA-256: 869fb459da66f9905bc574f6875fca1a576fe41c28501b81ae6396f700651dc6
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10344 bytes
SHA-256: 257dd652bc1600166006120ea6b044ad08a49b8fb91aacb609cbcd246a03b439